CN113387435A - Anaerobic digestion promotion method - Google Patents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/005—Combined electrochemical biological processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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Abstract
The invention provides an anaerobic digestion promotion method, which comprises the following steps: preparing inoculum, preparing electrodes, arranging an anaerobic digestion device and controlling electrolyzed water. The hydrolytic acidification bacteria in the anaerobic digestion device are divided into obligate anaerobic bacteria and facultative anaerobic bacteria, hydrogen-producing acetogenic bacteria and methanogen are obligate anaerobic bacteria, the purpose of adjusting the variety and the content of microorganisms in the system can be achieved as long as the oxygen concentration of each area in the anaerobic digestion device is controlled, the content of products in each stage of anaerobic digestion is adjusted by utilizing different functions of the microorganisms, the original single anaerobic digestion device is converted into a digestion system with obvious functions in each area, and the anaerobic digestion conversion rate is improved.
Description
Technical Field
The invention relates to a method for promoting anaerobic digestion, in particular to a method for promoting anaerobic digestion.
Background
With the rapid development of industry, a large amount of organic wastes such as excess sludge, high-concentration organic wastewater, agricultural wastes, kitchen wastes and the like are generated, if the organic wastes are not reasonably treated, the environment is seriously polluted, and how to realize the reduction, stabilization and harmless treatment of the wastes becomes a great problem which is urgently needed to be treated for environmental protection. Anaerobic digestion technology can reduce environmental pollution caused by waste and recover part of energy through generating methane, and is the most popular waste treatment technology at present. However, the conversion rate of anaerobic digestion waste in China is low, between 20% and 50%, and lower than that in developed countries, which also affects the popularization of anaerobic digestion technology in China, so that the improvement of the conversion rate of anaerobic digestion is a key part in the anaerobic treatment technology. In the digestion reaction, the microorganism is the key for maintaining the stable operation of the anaerobic digestion and efficiently producing the gas, so the type and the content of the microorganism in the anaerobic digestion are regulated and controlled, and the key for improving the energy conversion rate of the anaerobic digestion is realized.
The electrolysis hydrogen production and oxygen production technology is that when electricity is switched on in aqueous solution, hydrogen is produced at a cathode electrode, oxygen is produced at an anode electrode, and the oxygen content in a system is adjusted through on-off electricity, so that the purpose of adjusting and controlling the types and the content of microorganisms in anaerobic digestion is achieved, and the anaerobic digestion process of waste is finally promoted.
There is a related art search, for example, patent document 201810223820.5 proposes a test method for detecting anaerobic digestion based on electrochemical techniques. The method is carried out by the steps related to the culture of anaerobic digestion bacteria, the electrode activation treatment and the testing of anaerobic digestion. The method is short in detection time, accurate and effective in detection data, and more beneficial to analysis and analysis of the anaerobic digestion process, effectively overcomes the defect of the prior art in determination of anaerobic digestion indexes, and obtains more direct indexes for evaluating the anaerobic digestion performance. However, this method is based on an electrochemical technique, detects an intermediate product generated in an anaerobic process by using an electrochemical index such as cyclic voltammetry using an electrode, and represents the anaerobic digestion process according to a change in the index to represent the operating condition of the anaerobic digestion system, and it does not involve specific control of the anaerobic digestion process, nor does it improve the anaerobic digestion process in a targeted manner, nor does it effectively promote a substrate used by anaerobic microorganisms to improve the production efficiency.
Disclosure of Invention
The invention provides an anaerobic digestion promotion method, which is used for solving the technical problem of low substrate conversion rate in the anaerobic digestion process in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
an anaerobic digestion promotion method specifically comprises the following steps:
preparing an inoculum, namely culturing anaerobic digestion bacteria in an anaerobic digestion culture container, adding an anaerobic digestion substrate to be treated, and simultaneously adding carbon, nitrogen and phosphorus nutrients and sludge to perform strain culture to form the inoculum;
preparing an electrode, namely performing frosting treatment on the electrode, then performing water bath cleaning in an ultrasonic environment, and finally sequentially cleaning the electrode by using ethanol and distilled water for later use;
setting an anaerobic digestion device, namely adjusting the water content of an anaerobic digestion substrate to be treated, adding the anaerobic digestion substrate into an anaerobic digestion container, and adding the inoculum into the anaerobic digestion container; two electrodes are arranged in the anaerobic digestion container in pairs to serve as a cathode electrode and an anode electrode, and the power supply unit is connected between the cathode electrode and the anode electrode to form an anaerobic digestion device; and
and controlling the water electrolysis step, namely electrifying the power supply unit to electrolyze water to generate oxygen and hydrogen.
The anaerobic digestion device can be selected to be electrified in one or more subareas according to actual conditions, oxygen and hydrogen can be generated in the electrified subareas, the oxygen can promote the growth and the reproduction of facultative anaerobes in hydrolytic acidification bacteria in the subareas, the hydrolytic acidification capability is improved, more substrates which can be used for the hydrogen-producing and acetic acid-producing stage are generated, the hydrogen can enter the adjacent area, the growth and the reproduction of hydrogen methanogens in the adjacent area methane-producing stage are promoted, more methane can be synthesized by the hydrogen and carbon dioxide, and the purpose of reducing the carbon dioxide and improving the methane content is achieved.
The anaerobic digestion substrate to be treated is selected according to actual wastes, and the anaerobic digestion substrate selected by the invention is residual sludge of a sewage treatment plant, high-concentration organic wastewater, agricultural wastes, kitchen wastes and the like.
Preferably, the cathode electrode is a metal electrode or a non-metal electrode, the anode electrode is a non-metal electrode, and the metal electrode includes any one of a copper electrode, an iron electrode and a platinum electrode; the non-metallic electrode comprises a graphite electrode or a graphite modified electrode.
Preferably, in the step of preparing the inoculum, the carbon nitrogen phosphorus is mixed according to a mass ratio of 100: (2 to 8): and 1, adding.
Preferably, in the step of preparing the inoculum, the strain is kept still for 8 to 15 hours for standby after the culture of the strain is finished.
Preferably, in the step of providing an anaerobic digestion device, the anaerobic digestion substrate with the adjusted water content and the inoculum are mixed according to a mass ratio of 3: 2 to 2:1 into the anaerobic digestion vessel.
Preferably, in the step of controlling the electrolyzed water, the anaerobic digestion device is partitioned according to the size of the anaerobic digestion device, and at least one pair of a cathode electrode and an anode electrode is arranged in each partition.
Preferably, in the step of controlling electrolysis of water, the step of controlling electrolysis of water includes sequentially electrifying the power supply units of the respective zones to electrolyze water to generate oxygen and hydrogen; oxygen is used for promoting the growth and the propagation of facultative anaerobes in the hydrolytic acidification bacteria in the subarea and producing a substrate for a hydrogen-producing and acetic acid-producing stage; the hydrogen enters the adjacent area to promote the growth and the propagation of hydrogen methanogens in the adjacent area methane production stage, and the synthesis of methane by the hydrogen and the carbon dioxide is facilitated.
Preferably, the voltage range for energizing the power supply unit is 1.2V to 2.4V.
Preferably, the voltage applied to the power supply unit is a constant voltage.
The invention provides an anaerobic digestion promotion method, wherein hydrolytic acidification bacteria in an anaerobic digestion device are divided into obligate anaerobic bacteria and facultative anaerobic bacteria, hydrogen-producing acetogenic bacteria and methanogenic bacteria are obligate anaerobic bacteria, the purpose of adjusting the types and the contents of microorganisms in the system can be achieved as long as the oxygen concentration of each area in the anaerobic digestion device is controlled, the contents of products in each stage of anaerobic digestion are adjusted by utilizing different functions of the microorganisms, so that an original single anaerobic digestion device is converted into a digestion system with obvious functions in each area, and the anaerobic digestion conversion rate is improved. The technical scheme of the invention proves that the anaerobic digestion process can be promoted by generating oxygen and hydrogen through electrolyzing water and adjusting the types and the number of microorganisms, the process of electrolyzing water can be freely controlled by an oxygen detector and switching on and off, and the operation is simple and convenient. Solves the problems of long period and low conversion rate of the prior art adopting the conventional anaerobic digestion technology, and reduces the workload of anaerobic digestion. According to the technical scheme, the water electrolysis technology is applied to anaerobic digestion, the anaerobic digestion time is shortened by the aid of the promotion method, the anaerobic digestion process is facilitated, the defects in the prior art are effectively overcome, and high anaerobic digestion conversion rate is obtained.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a flow diagram of an anaerobic digestion promotion method provided in an embodiment of the present application.
Fig. 2 is a schematic structural diagram of an anaerobic digestion device provided in an embodiment of the present application.
Detailed Description
The invention discloses an anaerobic digestion promoting method, and a person skilled in the art can appropriately improve process parameters by referring to the content in the text. It is expressly intended that all such similar substitutes and modifications which would be obvious to those skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
The following detailed description of the invention refers to specific embodiments thereof for better understanding by those skilled in the art.
As shown in fig. 1, the anaerobic digestion promotion method specifically includes the following steps S1 to S4:
s1, preparing an inoculum, namely culturing anaerobic digestion bacteria in an anaerobic digestion culture container, adding an anaerobic digestion substrate to be treated, and simultaneously adding carbon, nitrogen and phosphorus nutrient substances and sludge to perform strain culture to form the inoculum;
s2, preparing an electrode, namely performing frosting treatment on the electrode, then performing water bath cleaning in an ultrasonic environment, and finally sequentially cleaning the electrode by using ethanol and distilled water for later use;
s3, setting an anaerobic digestion device, namely adjusting the water content of an anaerobic digestion substrate to be treated, adding the anaerobic digestion substrate into an anaerobic digestion container, and adding the inoculum into the anaerobic digestion container; two electrodes are arranged in the anaerobic digestion container in pairs to serve as a cathode electrode and an anode electrode, and the power supply unit is connected between the cathode electrode and the anode electrode to form an anaerobic digestion device;
and S4, controlling the water electrolysis step, and electrifying the power supply unit to electrolyze water to generate oxygen and hydrogen.
The anaerobic digestion device can be selected to be electrified in one or more subareas according to actual conditions, oxygen and hydrogen can be generated in the electrified subareas, the oxygen can promote the growth and the reproduction of facultative anaerobes in hydrolytic acidification bacteria in the subareas, the hydrolytic acidification capability is improved, more substrates which can be used for the hydrogen-producing and acetic acid-producing stage are generated, the hydrogen can enter the adjacent area, the growth and the reproduction of hydrogen methanogens in the adjacent area methane-producing stage are promoted, more methane can be synthesized by the hydrogen and carbon dioxide, and the purpose of reducing the carbon dioxide and improving the methane content is achieved.
In this case, the inoculum preparation step S1 and the electrode preparation step S2 need to be provided before the anaerobic digester step S3, but the order of the inoculum preparation step S1 and the electrode preparation step S2 is not strictly limited in the present application.
In this embodiment, the anaerobic digestion apparatus is constructed as shown in fig. 2, and the anaerobic digestion apparatus 10 includes an anaerobic digestion vessel 1, a cathode electrode 2 and an anode electrode 3, and a power supply unit 4 between the cathode electrode 2 and the anode electrode 3.
The anaerobic digestion substrate to be treated is selected according to actual wastes, and the anaerobic digestion substrate selected by the invention is residual sludge of a sewage treatment plant, high-concentration organic wastewater, agricultural wastes, kitchen wastes and the like.
In this embodiment, the cathode electrode 2 is a metal electrode or a non-metal electrode, the anode electrode 3 is a non-metal electrode, and the metal electrode includes any one of a copper electrode, an iron electrode, and a platinum electrode; the non-metallic electrode comprises a graphite electrode or a graphite modified electrode.
In this embodiment, in the step S1 of preparing the inoculum, the mass ratio of carbon, nitrogen and phosphorus is 100: (2 to 8): 1, preferably adding carbon, nitrogen and phosphorus according to a mass ratio of 100: 5: 1.
in this embodiment, in the step S1 of preparing the inoculum, the strain is left standing for 8 to 15 hours for use after the culture of the strain is completed. Preferably, the mixture is allowed to stand for 12 hours.
In this embodiment, in the step S3 of setting the anaerobic digestion unit, the ratio by mass of the anaerobic digestion substrate with the adjusted water content to the inoculum is 3: 2 to 2:1 into the anaerobic digestion vessel.
In this embodiment, in the step S4 of controlling the electrolyzed water, the anaerobic digestion device is partitioned according to its size, and at least one pair of a cathode electrode and an anode electrode is disposed in each partition.
In this embodiment, in the step S4 of controlling electrolyzed water, the step of controlling electrolyzed water is performed by sequentially energizing the power supply units of the respective zones to electrolyze water to generate oxygen and hydrogen; oxygen is used for promoting the growth and the propagation of facultative anaerobes in the hydrolytic acidification bacteria in the subarea and producing a substrate for a hydrogen-producing and acetic acid-producing stage; the hydrogen enters the adjacent area to promote the growth and the propagation of hydrogen methanogens in the adjacent area methane production stage, and the synthesis of methane by the hydrogen and the carbon dioxide is facilitated.
In this embodiment, the voltage range for energizing the power supply unit is 1.2V to 2.4V, and is preferably a constant voltage.
The invention provides an anaerobic digestion promotion method, wherein hydrolytic acidification bacteria in an anaerobic digestion device are divided into obligate anaerobic bacteria and facultative anaerobic bacteria, hydrogen-producing acetogenic bacteria and methanogenic bacteria are obligate anaerobic bacteria, the purpose of adjusting the types and the contents of microorganisms in the system can be achieved as long as the oxygen concentration of each area in the anaerobic digestion device is controlled, the contents of products in each stage of anaerobic digestion are adjusted by utilizing different functions of the microorganisms, so that an original single anaerobic digestion device is converted into a digestion system with obvious functions in each area, and the anaerobic digestion conversion rate is improved. The technical scheme of the invention proves that the anaerobic digestion process can be promoted by generating oxygen and hydrogen through electrolyzing water and adjusting the types and the number of microorganisms, the process of electrolyzing water can be freely controlled by an oxygen detector and switching on and off, and the operation is simple and convenient. Solves the problems of long period and low conversion rate of the prior art adopting the conventional anaerobic digestion technology, and reduces the workload of anaerobic digestion. According to the technical scheme, the water electrolysis technology is applied to anaerobic digestion, the anaerobic digestion time is shortened by the aid of the promotion method, the anaerobic digestion process is facilitated, the defects in the prior art are effectively overcome, and high anaerobic digestion conversion rate is obtained.
Example 1
S1, culturing anaerobic digestion bacteria, adding the excess sludge to be treated into an anaerobic digestion culture container, and adding the materials in a mass ratio of 100: 5: 1, performing strain culture on the carbon, nitrogen and phosphorus nutrients and sludge, and standing for 12 hours for later use after the strain culture is finished;
s2, carrying out electrode pretreatment, namely carrying out sanding treatment on a graphite electrode used for the system, then carrying out water bath cleaning in an ultrasonic environment, and finally sequentially cleaning with ethanol and distilled water for standby;
s3, adjusting the water content of the excess sludge to be treated, adding the excess sludge into an anaerobic digestion device, and mixing the rest sludge with the water according to the proportion of 3: 2, adding the cultured inoculum, meanwhile, placing a cathode electrode and an anode electrode according to the partition of the anaerobic digestion device, and connecting the connected cathode electrode and the connected anode electrode with an external constant voltage;
s4, applying a voltage of 1.2V to an area in the anaerobic digestion device, generating oxygen and hydrogen in the electrified subarea, wherein the oxygen promotes the growth and reproduction of facultative anaerobes in the hydrolytic acidification bacteria in the area, the hydrolytic acidification capability is improved, more substrates which can be used in the hydrogen-producing and acetic-acid-producing stage are generated, the hydrogen enters the adjacent area, the growth and reproduction of hydrogen methanogenic bacteria in the methane-producing stage of the adjacent area are promoted, the synthesis of more methane by the hydrogen and carbon dioxide is facilitated, and the methane yield is 2.22 times that of the unpowered device.
Example 2
S1, culturing anaerobic digestion bacteria, adding the excess sludge to be treated into an anaerobic digestion culture container, and adding the materials in a mass ratio of 100: 5: 1, performing strain culture on the carbon, nitrogen and phosphorus nutrients and sludge, and standing for 12 hours for later use after the strain culture is finished;
s2, carrying out electrode pretreatment, namely carrying out sanding treatment on a graphite electrode used for the system, then carrying out water bath cleaning in an ultrasonic environment, and finally sequentially cleaning with ethanol and distilled water for standby;
s3, adjusting the water content of the excess sludge to be treated, adding the excess sludge into an anaerobic digestion device, and mixing the rest sludge with the water according to the proportion of 3: 2, adding the cultured inoculum, meanwhile, placing a cathode electrode and an anode electrode according to the partition of the anaerobic digestion device, and connecting the connected cathode electrode and the connected anode electrode with an external constant voltage;
s4, 2.4V voltage is applied to one area in the anaerobic digestion device, oxygen and hydrogen are generated in the electrified subarea, the oxygen promotes the growth and the reproduction of facultative anaerobes in the hydrolytic acidification bacteria in the area, the hydrolytic acidification capability is improved, more substrates which can be used in the hydrogen-producing and acetic-acid-producing stage are generated, the hydrogen enters the adjacent area, the growth and the reproduction of hydrogen methanogenic bacteria in the methane-producing stage of the adjacent area are promoted, more methane is synthesized by the hydrogen and carbon dioxide, and the methane yield is 1.76 times of that of the unpowered device.
Example 3
S1, culturing anaerobic digestion bacteria, adding the excess sludge to be treated into an anaerobic digestion culture container, and adding the materials in a mass ratio of 100: 5: 1, performing strain culture on the carbon, nitrogen and phosphorus nutrients and sludge, and standing for 12 hours for later use after the strain culture is finished;
s2, carrying out electrode pretreatment, namely carrying out sanding treatment on a graphite electrode used for the system, then carrying out water bath cleaning in an ultrasonic environment, and finally sequentially cleaning with ethanol and distilled water for standby;
s3, adjusting the water content of the excess sludge to be treated, adding the excess sludge into an anaerobic digestion device, and mixing the rest sludge with the water according to the proportion of 3: 2, adding the cultured inoculum, meanwhile, placing a cathode electrode and an anode electrode according to the partition of the anaerobic digestion device, and connecting the connected cathode electrode and the connected anode electrode with an external constant voltage;
s4, applying a voltage of 1.8V to an area in the anaerobic digestion device, generating oxygen and hydrogen in the electrified subarea, wherein the oxygen promotes the growth and reproduction of facultative anaerobes in hydrolytic acidification bacteria in the area, the hydrolytic acidification capability is improved, more substrates which can be used in a hydrogen-producing and acetic-acid-producing stage are generated, the hydrogen enters the adjacent area, the growth and reproduction of hydrogen methanogens in a methane-producing stage of the adjacent area are promoted, more methane is synthesized by the hydrogen and carbon dioxide, and the yield of the methane is 1.08 times that of the unpowered device.
From example 1 to example 3, the results of producing biogas by anaerobic digestion of excess sludge with three different voltages of 1.2V, 2.4V and 1.8V have obvious difference, but have different degrees of promotion effects on anaerobic digestion, which shows that the promotion method is environment-friendly and effective, and can achieve the purpose of promoting anaerobic digestion by using the method of electrolyzing water.
The mechanism of the invention for promoting anaerobic digestion by utilizing hydrogen and oxygen generated by water electrolysis is as follows: after a certain intensity voltage is applied to the liquid phase, the effect of water electrolysis can be generated, namely oxygen is generated at the anode and hydrogen is generated at the cathode; according to the theory of three stages (hydrolysis acidification stage, hydrogen-producing and acetic acid-producing stage and methane-producing stage) of anaerobic digestion, the hydrolysis acidification stage is as follows: under the action of hydrolysis and fermentation bacteria, carbohydrate, protein, fat and the like can be converted into monosaccharide, amino acid, fatty acid, glycerol, carbon dioxide, hydrogen and the like; ② hydrogen-producing and acetic acid-producing stage: converting the products of the hydrolysis acidification stage into hydrogen, carbon dioxide and acetic acid under the action of hydrogen-producing acetogenic bacteria; ③ stage of methane production: under the action of two different types of methanogens, one group converts hydrogen and carbon dioxide to methane (hydrogenotrophic methanogenesis) and one group decarboxylates acetic acid to methane (acetoxy methanogenesis).
Based on the theory of three stages of anaerobic digestion, oxygen generated at the anode can promote the activity of partial facultative anaerobes in the hydrolysis acidification stage, promote the conversion of macromolecular organic matters such as carbohydrates and the like, provide substrates such as monosaccharide, amino acid, fatty acid and the like for the hydrogen-producing and acetic-acid-producing stage, and provide substrates such as hydrogen, carbon dioxide and the like for the methane-producing stage. The hydrogen generated at the cathode can be used as a substrate in a methane generation stage, so that the hydrogen nutrition type methane generation is promoted, the yield of methane is improved, and the content of carbon dioxide in the methane is reduced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An anaerobic digestion promotion method is characterized by comprising the following steps:
preparing an inoculum, namely culturing anaerobic digestion bacteria in an anaerobic digestion culture container, adding an anaerobic digestion substrate to be treated, and simultaneously adding carbon, nitrogen and phosphorus nutrients and sludge to perform strain culture to form the inoculum;
preparing an electrode, namely performing frosting treatment on the electrode, then performing water bath cleaning in an ultrasonic environment, and finally sequentially cleaning the electrode by using ethanol and distilled water for later use;
setting an anaerobic digestion device, namely adjusting the water content of an anaerobic digestion substrate to be treated, adding the anaerobic digestion substrate into an anaerobic digestion container, and adding the inoculum into the anaerobic digestion container; two electrodes are arranged in the anaerobic digestion container in pairs to serve as a cathode electrode and an anode electrode, and the power supply unit is connected between the cathode electrode and the anode electrode to form an anaerobic digestion device; and controlling the water electrolysis step, namely electrifying the power supply unit to electrolyze water to generate oxygen and hydrogen.
2. The anaerobic digestion promotion method of claim 1 wherein the cathode electrode is a metal electrode or a non-metal electrode, the anode electrode is a non-metal electrode, and the metal electrode comprises any one of a copper electrode, an iron electrode, and a platinum electrode; the non-metallic electrode comprises a graphite electrode or a graphite modified electrode.
3. The anaerobic digestion promotion method according to claim 1, wherein the anaerobic digestion substrate to be treated is one or more of excess sludge of sewage treatment plant, high concentration organic wastewater, agricultural waste, kitchen waste.
4. The anaerobic digestion promotion method of claim 1, wherein in the step of preparing the inoculum, phosphorus carbonitride is added in a mass ratio of 100: (2 to 8): and 1, adding.
5. The method for promoting anaerobic digestion according to claim 1, wherein in the step of preparing the inoculum, the strain is left to stand for 8 to 15 hours after the completion of culture.
6. The method for promoting anaerobic digestion according to claim 1, wherein in the step of providing an anaerobic digestion unit, the anaerobic digestion substrate after the water content adjustment and the inoculum are mixed in a mass ratio of 3: 2 to 2:1 into the anaerobic digestion vessel.
7. The anaerobic digestion promoting method as claimed in claim 1, wherein in the step of controlling the electrolyzed water, the anaerobic digestion unit is partitioned according to its size, and at least one pair of a cathode electrode and an anode electrode is disposed in each partition.
8. The anaerobic digestion promoting method according to claim 1, wherein in the water electrolysis controlling step, the water electrolysis controlling step sequentially energizes the power supply units of the respective zones to electrolyze water to generate oxygen and hydrogen; oxygen is used for promoting the growth and the propagation of facultative anaerobes in the hydrolytic acidification bacteria in the subarea and producing a substrate for a hydrogen-producing and acetic acid-producing stage; the hydrogen enters the adjacent area to promote the growth and the propagation of hydrogen methanogens in the adjacent area methane production stage, and the synthesis of methane by the hydrogen and the carbon dioxide is facilitated.
9. The anaerobic digestion promotion method of claim 1, wherein the voltage range of energizing the power supply unit is 1.2V to 2.4V.
10. The anaerobic digestion promotion method of claim 1, wherein the voltage at which the power supply unit is energized is a constant voltage.
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| CN102352309A (en) * | 2011-10-21 | 2012-02-15 | 南京工业大学 | Electrolytically promoted anaerobic fermentation apparatus and application method thereof |
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| CN105036500A (en) * | 2015-07-28 | 2015-11-11 | 同济大学 | Method for improving anaerobic digestion efficiency of organic wastes and content of methane in biogas |
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| CN102352309A (en) * | 2011-10-21 | 2012-02-15 | 南京工业大学 | Electrolytically promoted anaerobic fermentation apparatus and application method thereof |
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